| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrict a treading force for a brake pedal and a variation in its stroke when a primary piston is moved back during a parking state of vehicle and further eliminate any irregular feeling of a driver. <P>SOLUTION: A vehicular braking force control device is provided, wherein when a primary piston is moved back with an electric motor for an electric braking force assisting means during a parking state of a vehicle, a wheel cylinder pressure reducing means removes working fluid within a wheel cylinder into a reservoir while supplying the working fluid into the wheel cylinder with an electric pump of a VDC control system to reduce a pressure within the wheel cylinder down to a continuous operable pressure of the electric motor, then a master cylinder pressure reducing means reduces a pressure of a master cylinder down to the continuous operable pressure of the electric motor by moving back the primary piston with the electric motor to its predetermined position while keeping a sum of a reaction force of an input rod caused by a pressure of the master cylinder and a reaction force got from an offset spring pushed back by the primary piston constant during returning the working fluid stored in the reservoir with the electric pump to the master cylinder. <P>COPYRIGHT: (C)2010,JPO&INPIT |
